Landing: 4e0964279b73
Project / Subsystem
gcc / gcc/vect
Date
2026-05-20
Author
Alfie Richards
Commit
4e0964279b73d3af5b085f731c87c200b7564db4
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- gcc/vect
- patch_id
- —
- commit_hash
- 4e0964279b73d3af5b085f731c87c200b7564db4
- source_type
- github
- headline
- Vectorizer uses LOOP_VINFO_IV_INCREMENT for loop induction variables
- tldr
- Vectorizer now uses a new value, LOOP_VINFO_IV_INCREMENT, improving loop variant induction variable handling.
- author
- Alfie Richards
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • vectorization
- • optimization
- • compiler
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-05-20T00:00:00.000Z
The GCC vectorizer introduces LOOP_VINFO_IV_INCREMENT to store the number of scalar iterations a vectorized loop iteration represents. This change allows induction variable (IV) updates and reductions to correctly use this value, including loop-variant IV increments. This simplifies internal logic by removing special cases for SELECT_VL and enables more flexible handling of pointer arithmetic in grouped loads and stores.